* {
    box-sizing: border-box;
}

body {
    margin: 0;
}

/* 头部样式 */
.header {
    background-color: #f1f1f1;
    padding: 20px;
    text-align: center;
}

/* 导航条 */
.topnav {
    overflow: hidden;
    background-color:  rgb(30, 161, 212);
}

/* 导航链接 */
.topnav a {
    float: left;
    display: block;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
}

/* 链接 - 修改颜色 */
.topnav a:hover {
    background-color: #ddd;
    color: black;
}
#searchBox{
   float: right;
}
.searchNext{
    height: 35px;
    width: 700px;
}
#pagingBox{
    display: flex;
    flex-direction: row;
}
.paging{
    height: 35px;
    width: 640px;
}
#this{
    background-color: black;
}